Shoes.app do
  clock = banner(Time.now.strftime("%H:%M:%S"))
  clock.move(100, 100)
  fill(rgb(255, 255, 255))
  maru = oval(:left => rand(400), :top => rand(300), :radius => 20, :center => true)
  animate(1) do
    clock.replace(Time.now.strftime("%H:%M:%S"))
    maru.move(rand(400), rand(300))
  end
end
